78940481 has 2 divisors, whose sum is σ = 78940482. Its totient is φ = 78940480.

The previous prime is 78940453. The next prime is 78940483. The reversal of 78940481 is 18404987.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61089856 + 17850625 = 7816^2 + 4225^2 .

It is an emirp because it is prime and its reverse (18404987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78940481 - 2¹⁰ = 78939457 is a prime.

It is a super-2 number, since 2×78940481² = 12463199081022722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 78940483, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78940483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39470240 + 39470241.

It is an arithmetic number, because the mean of its divisors is an integer number (39470241).

Almost surely, 2^78940481 is an apocalyptic number.

It is an amenable number.

78940481 is a deficient number, since it is larger than the sum of its proper divisors (1).

78940481 is an equidigital number, since it uses as much as digits as its factorization.

78940481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 78940481 is about 8884.8455811004. The cubic root of 78940481 is about 428.9762575994.

The spelling of 78940481 in words is "seventy-eight million, nine hundred forty thousand, four hundred eighty-one".